A cost-effective methodology for operating the 349-pixel
Cerenkov light imaging camera of the imaging element of the TACTIC
γ-ray telescope array at stable single-counts rate and safe anode
current values has successfully been tried out despite variations in the light
of the night sky experienced by these pixels from time to time. Important
details of this unconventional scheme are discussed and reference is made to
the methods evolved for in situ absolute and relative gain
calibrations of the camera pixels, which are particularly required for this
mode of operation.
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